I've tried looking around, and have had trouble researching this subject. Anyone know a site where they describe the various methods used by protein chemists to engineer new medicines?
I would suggest talking to a professor of pharmacology at a university. Below are a few specific searches you can browse for info.
http://www.google.com/search?hl=en&lr=&safe=off&as_qdr=all&q=+%22designer+proteins%22+medicine
http://www.google.com/search?as_q=+drugs&num=10&hl=en&btnG=Google+Search&as_epq=designer+proteins+&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=any&as_dt=i&as_sitesearch=&as_rights=&safe=active
http://www.google.com/search?hl=en&lr=&safe=active&as_qdr=all&q=%22new+drugs%22+%22designer+proteins+%22
http://www.google.com/search?as_q=&num=10&hl=en&btnG=Google+Search&as_epq=new+drugs&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&as_sitesearch=&as_rights=&safe=active
http://www.google.com/search?as_q=&num=10&hl=en&btnG=Google+Search&as_epq=new+drugs&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&as_sitesearch=.edu&as_rights=&safe=active